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Mechanical pump set assembling method for molten steel degassing and mechanical pump set system

A composition method and mechanical pump technology, applied in the direction of elastic fluid rotary piston type/oscillating piston type pump combination, mechanical equipment, machine/engine, etc., can solve the loss of pumping capacity and gas load distribution of a pump group module Inhomogeneity, lack of adjustment performance and other problems, to achieve the effect of low long-term operation and maintenance costs, good adjustable performance, and wide adjustment range

Inactive Publication Date: 2018-06-19
上海宽量节能环保技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] 4.1 In the existing pump group with cascaded pump modules connected in parallel, the mechanical pumps at all levels work at the upper limit of their allowable working pressure, the gas compression generates a lot of heat, and the pumping efficiency is low
[0014] 4.2 In the parallel connection of existing cascade pump modules, if any part of any pump fails, the pumping capacity of one pump module will be lost
[0015] 4.3 The existing cascaded pump modules connected in parallel do not have regulation performance
[0016] 4.4 The existing cascaded pump modules connected in parallel occupy a large space
[0017] 4.5 The curve (pressure-time curve of vacuuming) is restricted, it is easy to cause the pump not to work in its best working condition, and the efficiency is low
And the pump set takes up a lot of space, which is not conducive to reasonable layout on site
The adjustment performance of the existing fully parallel mechanical pump unit is greatly affected by the number of pumps, and it may be due to the uneven distribution of gas load (unbalanced load), and some pumps exceed the operating conditions (current, torque) during the adjustment process. Interference, even automatic protective shutdown, affecting normal operation

Method used

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  • Mechanical pump set assembling method for molten steel degassing and mechanical pump set system
  • Mechanical pump set assembling method for molten steel degassing and mechanical pump set system
  • Mechanical pump set assembling method for molten steel degassing and mechanical pump set system

Examples

Experimental program
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Effect test

Embodiment 1

[0057] A method for composing a mechanical pump unit for molten steel degassing. It is composed of a plurality of pumps A. Each pump unit is connected in parallel with the intake manifold and then connected to the suction port of the vacuum tank, and the exhaust port of each pump unit is connected with The outlet header is connected in parallel and connected to the atmosphere;

[0058] The suction port of the vacuum tank is connected with the suction port of the molten steel degassing device that needs to be evacuated;

[0059] Each pump group includes at least a first-stage pump, a second-stage pump, and a third-stage pump (the first-stage pump, the second-stage pump, the third-stage pump, the fourth-stage pump, and the fifth-stage pump in this case are the first-stage pump unit and the second-stage pump respectively. Unit, three-stage pump unit, four-stage pump unit, and five-stage pump unit), and the first-stage pump, second-stage pump, and third-stage pump adopt large air volum...

Embodiment 2

[0076] See Figure 1-Figure 3 , The structure shown is the three mechanical pump system designed based on the above method, among which:

[0077] figure 1 Shown in is the first type of mechanical pump system. Multiple pump groups A are connected in parallel with the intake manifold 610 through pipes and then connected to the vacuum tank 500. Each pump group is composed of a five-stage pump group unit. The group unit is formed by connecting at least two pumps in parallel, and the exhaust port of each pump group is connected in parallel with the gas outlet header;

[0078] Further, the five-level pump unit units are:

[0079] The first-stage pump unit (first-stage pump) 100 is composed of 5 Roots vacuum pumps with an effective suction capacity of 25000 m3 / h@67Pa 20℃ in parallel;

[0080] The two-stage pump unit (two-stage pump) 200 is composed of 3 18000~20000 m3 / h Roots vacuum pumps in parallel;

[0081] The three-stage pump unit (three-stage pump) 300 is composed of two 4000~10000 m3 / ...

Embodiment 3

[0094] See figure 2 , The second type of mechanical pump system is shown. The difference from the second embodiment is:

[0095] The exhaust port of the four-stage pump unit is connected in parallel with the exhaust branch pipe 630, and the exhaust branch pipe 630 is connected in parallel with the exhaust port of the five-stage pump unit through the intake branch pipe 640. This method can increase the stability and adjustability of the entire mechanical pumping system.

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Abstract

The invention discloses a mechanical pump set assembling method for molten steel degassing. The method involves a mechanical pump set which comprises at least one pump set, wherein each pump set is connected in parallel with an inlet gas collecting pipe in a communication manner and then communicates with a gas pumping port of a molten steel degassing device to be vacuumized; a gas outlet of eachpump set is connected in parallel with an outlet gas collecting pipe in a communication manner and then is connected to atmosphere; each pump set comprises at least one first-stage pump, a second-stage pump, a third-stage pump and a backing pump; each backing pump is a large screw pump or an efficient two-stage water ring vacuum pump; pump machines, at the same grade, of each main pump, each second-stage pump, each third-stage pump and each fourth-stage pump are mounted in a parallel connection manner; inlet gas of the pump at each grade is uniformly distributed to each pump machine through the inlet gas collecting pipe; the gas outlet of the pump set unit at each grade is collected through a gas outlet pipe and then enters the pump machine at next grade to be compressed; the gas outlet ofeach backing pump communicates with the outlet gas collecting pipe in a parallel connection manner; the outlet gas collecting pipe communicates with the atmosphere. The invention also discloses a mechanical pump set system constructed by the abovementioned method. The mechanical pump set system is high in redundancy of gas pumping capacity; and the production safety is high.

Description

Technical field [0001] The invention relates to a molten steel degassing pump set, in particular to a method for forming a mechanical pump set for degassing molten steel and a mechanical pump set thereof. Background technique [0002] The traditional molten steel degassing mechanical pump group is generally composed of two-stage Roots pump + backing pump or three-stage Roots pump + backing pump. Screw pumps and water ring vacuum pumps have smooth suction curves, no water pollution or very little The most widely used water pollution. [0003] Based on the current Roots pump and backing pump equipment technology and the process requirements of the molten steel degassing system, as well as the actual application cases of the molten steel mechanical pump system, a set of vacuum pumps used in the molten steel degassing system should use at least two-stage Roots pumps and one The first stage backing pump can meet the vacuum requirements of the molten steel degassing process. For the th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04C23/00F04C25/02C21C7/10
CPCF04C23/00C21C7/10F04C25/02
Inventor 庄斌刘迎春沈淼乐
Owner 上海宽量节能环保技术有限公司
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